Long-term and Short-term Debt (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 12, 2023	Mar. 31, 2023	Feb. 10, 2023	Jan. 06, 2023	Jul. 11, 2022	Mar. 31, 2022
Debt Instrument [Line Items]
Other Short-term Borrowings		$ 119	$ 76
Short-term Debt, Weighted Average Interest Rate, at Point in Time		8.63%	5.23%	1.41%
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		$ 108	$ 87
Long Term Debt Aggregate Maturities, Year One		1,800
Long Term Debt Aggregate Maturities, Year Two		1,300
Long Term Debt Aggregate Maturities, Year Three		180
Long Term Debt Aggregate Maturities, Year Four		52
Long Term Debt Aggregate Maturities, Year Five		348
Long-term Debt, Maturities, Repayments of Principal after Year Five		11,900
Interest Expense, Debt		740	655	$ 647
Senior notes
Debt Instrument [Line Items]
Debt Instrument, Principal Outstanding		$ 14,622	13,671
Debt Instrument, Interest Rate, Stated Percentage		5.70%
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		$ 106	83
Other Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Principal Outstanding		495	500
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		2	$ 3
Senior Debt $500 Million 3.048% which matures in December 2022
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			3.048%
Early Repayment of Senior Debt			$ 500
Redemption Premium			17
senior debt 1.0 billion July 2052
Debt Instrument [Line Items]
Debt Instrument, Face Amount									$ 1,000
Debt Instrument, Interest Rate, Stated Percentage									5.00%
Debt Issuance Costs, Gross									$ 11
senior debt $1.0 billion July 2033
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 1,000
Debt Instrument, Interest Rate, Stated Percentage					5.375%
Redemption Premium		6
Senior Debt $1.0 billion 4.368% September 2023
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							4.368%
Early Repayment of Senior Debt		1,000
senior debt $1.0 billion January 2054
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 1,000
Debt Instrument, Interest Rate, Stated Percentage								5.25%
Redemption Premium	$ 11
Securities Sold under Agreements to Repurchase [Member]
Debt Instrument [Line Items]
Other Short-term Borrowings		115	$ 76
Parent Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.23%	212.00%		124.00%				100.00%
Long Term Debt Aggregate Maturities, Year One		1,400
Long Term Debt Aggregate Maturities, Year Two		1,200
Long Term Debt Aggregate Maturities, Year Three		476
Long Term Debt Aggregate Maturities, Year Four		0
Long Term Debt Aggregate Maturities, Year Five		237
Long-term Debt, Maturities, Repayments of Principal after Year Five		12,700
Interest Expense, Debt		907	$ 829	$ 847
Committed Credit Facility Six [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		2,499
Line of Credit Facility, Maximum Borrowing Capacity		2,896
Committed Credit Facility Six [Member] | Brighthouse Financial, Inc
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		$ 2,500